Curling usually comes from tension, stitch height or a foundation row that does not have enough room to relax. The good news is that most causes are easy to identify.

1. Your starting chain is too tight

If the bottom edge curves upward, make the foundation chain with a hook one size larger, then switch back for the first row.

2. Your stitch count is changing

Missed edge stitches make a piece narrow while accidental extra stitches make it flare. Count each row until the edges become consistent.

3. Your tension changed

Beginners often tighten their grip as they concentrate. Relax your yarn hand and let the hook move instead of pulling each stitch closed.

4. A round project needs different increases

If a circle cups, you may need more increases. If it ruffles, you may have too many. Lay the work flat every few rounds and check.

5. Blocking can help

For natural fibers and many acrylics, gentle blocking can settle minor curling after the stitch count and tension are correct.